exam Maths Puzzle Numerical Ability

Calculate the standard deviation for the following data set: 16, 35, 25, 29, 26, 30

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exam Other Question

A rectangular piece of tin measures 36 in. by 25 in. A square measuring 4 in. by 4 in. is cut out of each corner and the sides are folded to form a box. What is the volume of the box? why is it that a negative plus a negative equal a positive